How does Nmap know a port is filtered?

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Tags

  1. #machine
  2. #network
  3. #describe
  4. #blocking
  5. #filtered
  6. #closed
  7. #target
  8. #connections
  9. #listening
  10. #means
  11. #whether
  12. #which
  13. #filter
  14. #determine
  15. #application
  16. #obstacle
  17. #states
  18. #firewall
  19. #cannot
  20. #other
  21. #packets